Be careful if/when u decide to drill the right side, on my digger I did an excellent job, on my nephews curse, so far im 0 for 2, he has ripped out 2 screws on that side. He doesn't care since hes 9 , but it annoys the heck outta me, heh.
Did you drill from the bottom or from the side? Did you use a screw and bolt? What went wrong? I thinking drilling a hole with that little material will be a challenging getting enough "meat" to hold.